12 hrs seems like a long time in Hindsight  but I highly doubt that Washington had a clear picture ASAP..  Those men who died defending died doing what they were paid to do  they accepted the risk and should be seen as heros ..   Not sure how Air support would have changed the outcome The distance from Aviano Air Force Base (AFB) in Italy to Benghazi is 1044 miles  again this sounds easy if Aviano had f16s on the runway fueled and armed and even if launched an hour or 2 after the attack started add filght time and time on target danger close on a 500lb bomb   is   Mk-82 LD 500-lb bomb is 250 425 meters  whos talking to the planes and do they know where other friendly forces are many variables ? 
http://www.globalsecurity.org/milita...-23-1/appf.pdf
Ambassador Steven's  who  one would suspect had the most current intell  felt it was safe to be so far from Tripoli "Driving distance from Tripoli to Benghazi is 998 kilometers (620 miles)" yes it was ugly but it seems we dont mention all who were not killed .. and the movie and the book i feel were  made to  cash in .. not because some moral high ground to set the record straight . kinda of like the 2 seals saying they kill bin laden   ...  I wasn't there  but my comments are formulated by my Combat experiences as in Infantry Plt Sgt in Iraq and how information flows thru the system we call the Armed forces .. its  called the fog of war for a reason  Black hawk down comes to mind